Car Refinance Calculator

When auto refinancing pays off, and when it doesn't

Auto refinancing makes sense when at least one of these is true: your credit score improved 40+ points since you bought, current market rates are 1%+ lower than your loan rate, you originally financed through a dealer at marked-up rates, or you're in the first half of your loan term with meaningful remaining interest. Late-stage loans (under 12 months remaining) typically don't save enough to justify the paperwork.

Many borrowers don't realize how much room they have. Dealers often mark up the buy rate they get from lenders by 2-3 percentage points (this is their finance department's profit). A buyer with 720+ credit who walked out with 8.5% might genuinely qualify for 5.5% at any major bank or credit union. Refinancing in months 3-6 of a new auto loan, after credit history has had time to update, captures this difference.

Worked example: $25,000 remaining balance, 48 months remaining, current rate 9%. Refinancing to 5.5% at the same 48-month term: monthly payment drops from $622 to $581. Total interest paid over remaining term: $4,856 (current) vs $2,888 (new). Savings: $1,968. Worth it even with a $200 refinance fee.

The "extended term" trap

Most refinance applications offer "lower monthly payment!" by stretching the term. Refinancing 48 months remaining into a new 72-month loan certainly lowers the monthly payment, but you'll pay more total interest because the loan lasts longer at any rate. This often leaves borrowers "underwater" (owing more than the car is worth) for the entire new term.

Best practice: match or shorten your remaining term when refinancing. If you had 48 months left, refinance into 48 months at the lower rate. If you can afford it, refinance into 36 months, even bigger savings. Only extend the term if you're in genuine financial hardship and need lower payments to stay current. Treat term extension as a last-resort relief tool, not a default refinancing tactic.

Cars depreciate roughly 15-25% per year. Extending the loan term means you'll be underwater longer, and if the car is totaled in an accident, gap insurance is the only thing protecting you from owing money on a car you no longer have. Match loan length to expected ownership period to avoid this problem.

2026 auto refi rates and where to shop

2026 auto refinance rates by credit tier (approximate): 720+ score: 4.5-6.5%. 660-719: 6.5-9%. 600-659: 9-12%. Below 600: 12-18% if available at all. Used-car loans typically carry 0.5-1% higher rates than new-car. Credit union members often get 0.5-1% better than bank rates.

Best places to shop: credit unions (PenFed, Navy Federal, Alliant, joining is free or near-free for most people). LightStream (SunTrust/Truist consumer arm), MyAutoLoan (aggregator), Capital One Auto Navigator, Auto Approve. Online lenders typically have lower overhead and pass savings through.

Avoid: dealership refinance offers (similar markup problem to original financing), debt consolidation that wraps the car into a personal loan (typically worse rates and unsecured), and "BHPH" (buy-here-pay-here) refinance scams targeting subprime borrowers (often worse terms than original).

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